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Integrated Circuit Systems, Inc.
9154A
Low-Cost 16-Pin Frequency Generator
General Description
The 9154A is a 0.8mm version of the industry leading 9154. Like the 9154, the 9154A is a low-cost frequency generator designed for general purpose PC and disk drive applications. However, because the 9154A uses 0.8mm technology and the latest phase-locked loop architecture, it offers performance advantages that enable the device to be sold into PentiumTM systems. The 9154A guarantees a 45/55 duty cycle over all frequencies. In addition, a worst case jitter of 250ps is specified at Pentium frequencies. The CPU clock offers the unique feature of smooth, glitchfree transitions from one frequency to the next, making this the ideal device to use when slowing the CPU speed. The 9154A makes a gradual transition between frequencies so that it obeys the Intel cycle-to-cycle timing specifications for 486 and Pentium systems. The 9154A-42 and 9154A-43 devices offer features specifically for green PCs. The 9154A-42 and -43 have a single pin that, when pulled low, will smoothly slow the 2XCPU clock to 8 MHz. This is ideal for dynamic DX microprocessors. The 9154A-43 not only has the slow clock feature, but also offers a glitch-free stop clock for static SX microprocessors. The STOPCLK# pin, when pulled low, enables the 2XCPU clock to go low only after completing its last full cycle. The clock continues to run internally, and will be output again on the first full cycle immediately following stop clock disable. The simultaneous 2X and 1X CPU clocks offer controlled skew to within 500ps of each other (-42 only). ICS has been shipping motherboard frequency generators since April 1990, and is the leader in the area of multiple output clocks on a single chip. Consult ICS for all your clock generation needs.
Features
* * * * * * * * * * * Compatible with 386, 486 and Pentium CPUs 45/55 Duty cycle Runs up to 66 MHz at 3.3V Single pin can slow clock to 8 MHz (on -42 and -43) Single pin can stop the CPU clock glitch-free (on -43) Very low jitter, 250ps for Pentium frequencies 1X and 2X CPU clocks skew controlled to 250ps (-42 only) Smooth transitions between all CPU frequencies Slow frequency ramp at power-on avoids CPU lock-up 16-pin 150-mil skinny SOIC packages 0.8m CMOS technology
Applications
Computer motherboards: The 9154A replaces crystals and oscillators, saving board space, component cost, part count and inventory costs. It produces a switchable CPU clock and up to four fixed clocks to drive floppy disk, communications, super I/O, Bus, and/or keyboard devices. The small package and 3.3V operation is perfect for handheld computers.
Block Diagram
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Integrated Circuit Systems, Inc.
9154A
Pin Configuration
16-SOIC 9154A-27CS16
16-SOIC 9154A-42CS16
Description of new pin: SLOWCLK# forces 2XCPUCLK output to ramp smoothly to 8MHz and CPUCLK output to 4 MHz when pulled low.
16-SOIC 9154A-43CS16
Description of new pis: SLOWCLK# forces 2XCPUCLK output to ramp smoothly to 8MHz when pulled low. STOPCLK# provides gilitch-free stop of the 2XCPUCLK output when pulled low. When raised back high, the 2XCPUCLK output clock resumes full speed operation (no clock frequency ramp up since the internal VCO is not stopped).
16-SOIC 9154A-04CS16
TE LE O S B O 16-SOIC
9154A-26CS16
16-SOIC 9154A-10CS16
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Integrated Circuit Systems, Inc.
9154A
Stop Clock Feature
The 9154A-43 incorporates a unique stop clock feature compatible with static logic processors. When the stop clock pin goes low, the 2XCPUCLK will go low after the next occurring falling edge. When STOPCLK again goes high, 2XCPUCLK resumes on the next rising edge of the internal clock. This feature enables fast, glitch-free starts and stops of the 2XCPUCLK and is guaranteed that the CPU does not receive any short period clocks.
2XCPUCLK
STOPCLK#
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Integrated Circuit Systems, Inc.
9154A
Pin Descriptions
Frequencies based upon 14.318 MHz input)
-4 4 13 5 12 8 1 16 10 3 2 11 6 7 14 15 9 -10 4 13 5 12 8 16 15 3 2 10 7 11 6 1 14 9 PIN NUMBER -26 -27 4 4 13 13 5 5 12 12 8 8 1 16 10 9 3 2 11 6 7 14 15 16 15 10 9 3 2 11 1 6 7 14 PIN NAME -42 4 13 5 12 8 1 16 9 15 3 2 10 6 7 11 14 -43 4 13 5 12 8 1 16 10 15 9 3 2 11 6 7 14 VDD VDD GND GDD AGND FS0 FS1 FS2 OE SLOWCLK# STOPCLK# X1 X2 14.318 MHz 1.84 MHz 24 MHz 16 MHz 12 MHz 8 MHz CPUCLK 2XCPUCLK PD# PDFCLK# TYPE P P P P P I I I I I I I O O O O O O O O O I I DESCRIPTION Digital power (3.3 or 5V). Digital power (3.3 or 5V). Digital ground. Digital ground. Analog ground. Frequency select 0 for CPU clock (has internal pull-up).* Frequency select 1 for CPU clock (has internal pull-up).* Frequency select 2 for CPU clock (has internal pull-up).* Tristates outputs when low (has internal pull-up).* Slows 2XCPU clock to 8 MHz (active low) (has internal pull-up). Stops 2XCPU clock glitch-free (active low) (has internal pull-up). Crystal In. Crystal Out. 14.318 MHz reference clock output. 1.84 MHz (comm) clock output. 24 MHz (floppy disk) clock output. 16 MHz clock output. 12 MHz keyboard clock output. 8 MHz keyboard clock output. CPU clock output. 2X CPU clock output. Power-Down All (active low) (has internal pull-up). Power-Down Fixed Clock (1.84, 8, 16, 24) (active low).*
Note: Internal Pull-up Resistors. * -04 and -10 have no pull-ups or frequency select pins ** -10 has no pull-up or Pin 9 PDFCLK
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Integrated Circuit Systems, Inc.
9154A
Clock Tables (using 14.318 MHz input, all frequencies in MHz) FS2 0 0 0 0 1 1 1 1 FS1 0 0 1 1 0 0 1 1 FS0 0 1 0 1 0 1 0 1 -27 2XCPUCLK 75* 32 60 40 50 66.66 80* 52 -42 2XCPUCLK 16 40 33.33 25 60 20 66.66 50 CPUCLK 8 20 16.67 12.5 30 10 33.33 25 -43 2XCPUCLK ^ 16 40 33.33 25 60 20 66.66 50
FS2 0 0 0 0 1 1 1 1
FS1 0 0 1 1 0 0 1 1
Actual Frequencies (using 14.318 MHz input, all frequencies in MHz) -27 -42 FS0 2XCPUCLK CPUCLK 2XCPUCLK 0 75.17* 16.00 8.00 1 31.94 40.09 20.05 0 60.14 33.41 16.71 1 40.09 25.06 12.55 0 50.11 60.14 30.07 1 66.48 20.05 10.03 0 80.18* 66.48 33.24 1 51.90 50.11 25.06
-43 2XCPUCLK 16.00 40.09 33.41 25.06 60.14 20.05 66.48 50.11
Fixed Clock Output Actual Frequencies
(using 14.318 MHz input, all frequencies in MHz) 14.318 1.84 24.0 12.0 8.0
Clock Tables in MHz for -04 and -10
(using 14.318 MHz input, all frequencies in MHz) FS(3:0) 0 1 2 3 4 5 6 7 -04 2XCPU 100* 80* 66.6 50 40 32 24 16 CPU 50* 40* 33.3 25 20 16 12 8 -10 CPUCLK PDCPU 40 50 66.6 -
Clock Table for 9154A-26
(using 14.318 MHz input, all frequencies in MHz) FS(2:0) 0 1 2 3 4 5 6 7 2XCPU (MHz) 100.23* 80.18* 66.48* 50.11 40.09 32.22 24.23 15.75 CPUCLK (MHz) 50.11 40.09 33.24 25.06 20.05 16.11 12.12 7.88
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Integrated Circuit Systems, Inc.
9154A
Absolute Maximum Ratings
VDD referenced to GND .......................................................................... 7.0 V Voltage on I/O pins referenced to GND . . . . . . . GND - 0.5 V to VDD + 0.5 V Operating Temperature under bias . . . . . . . . . . 0 to +70 C Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . 0.5 W Storage Temperature . . . . . . . . . . . . . . . . . . . . . -40 to +150 C Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. These ratings are stess specifications only and functional operation of the device at these or any other conditions above those listed in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect product reliability.
Electrical Characteristics at 3.3 V
VDD = 3.3 V 10%, TA = 0 - 70 oC unless otherwise stated
PARAMETER Input Low Voltage Input High Voltage Input Low Current Input High Current Output Low Voltage Output High Voltage1 Output Low Current1 Output High Current1 Supply Current Output Frequency Change over Supply and Temperature1 Short circuit current1 Input Capacitance1 Load Capacitance1 Pull-up Resistor1
SYMBOL VIL VIH IIL IIH VOL VOH IOL IOH IDD FD ISC CI CL Rpu
DC Characteristics TEST CONDITIONS
VIN = 0V (pull-up pin) VIN = VDD IOL = 6mA IOH = -4mA VOL = 0.2VDD VOH = 0.7VDD unloaded, 60 MHz With respect to typical frequency each output clock except X1, X2 pins X1, X2 at VDD - 0.5V
MIN TYP MAX 0.2 VDD 0.7 V 2.5 7 -5 5 0.05 VDD 0.1 VDD 0.85 VDD 0.94 VDD 15 24 -13 -8 16 34 20 0.002 30 20 620 0.01 10 900
UNITS V V A A V V mA mA mA % mA pF pF k ohm
Notes: 1. Parameter is guaranteed by design and characterization.
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Integrated Circuit Systems, Inc.
9154A
Electrical Characteristics at 3.3 V o
VDD = 3.3 V 10%, TA = 0 - 70 C unless otherwise stated
AC Characteristics PARAMETER Input Clock Rise Time1 Input Clock Fall Time1 Rise time, 20% to 80% VDD1 Fall time, 80% to 20% VDD1 Duty cycle at 50% VDD1 Duty cycle, reference clocks1 Jitter, one sigma, 2066 MHz clocks1 Jitter, one sigma, clocks below 20 MHz1 Jitter, absolute, 20-66 MHz clocks1 Jitter, absolute, clocks below 20 MHz1 Input Frequency1 Maximum Output Frequency1 Clock skew between CPU and 2XCPU outputs1 Power-up Time1 Frequency Transition Time1 SYMBOL tICr tICf tr tf dt dt tj1s tjls tjab tjab fin fout Tsk ttPO tft 9154A-42 off to 50 MHz from 8 to 50 MHz 15pF load 15pF load 15pF load 15pF load 10,000 cycles 10,000 cycles 10,000 cycles 10,000 cycles TEST CONDITIONS MIN 40/60 50/65 -350 2 70 TYP 2. 2 1.2 48/52 43/57 100 1.0 1.5 14.318 220 6 4. 5 MAX 20 20 3.5 2.5 60/40 65/50 200 2.0 350 4.0 32 500 12 10 UNITS ns ns ns ns % % ps % ps % MHz MHz ps ms ms
Notes: 1. Parameter is guaranteed by design and characterization. Not subject to production testing.
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Integrated Circuit Systems, Inc.
9154A
Electrical Characteristics at 5.0 V
VDD = +5 10% V, TA = 0 - 70oC unless otherwise stated
PARAMETER Input Low Voltage Input High Voltage Input Low Current Input High Current Output Low Voltage Output High Voltage1 Output Low Current1 Output High Current1 Supply Current Output Frequency Change over Supply and Temperature1 Shor t circuit current1 Input Capacitance1 Load Capacitance1 Pull-up Resistor1
SYMBOL VIL VIH IIL IIH VOL VOH IOL IOH I DD FD ISC CI CL Rpu
DC Characteristics TEST CONDITIONS VDD=5 V VDD=5 V VIN=0 V (pull-up pin) VIN = VDD IOL = 10 mA IOH = -30 mA VOL = 0.8 V VOH = 2.4 V unloaded, 66 MHz with respect to typical frequency each output clock except X1, X2 pins X1, X2 A + VDD -1 V
MIN 2.0 -5 2.4 25 25 -
TYP 6 0.15 3.7 45 -53 25 0.002 40 20 400
MAX 0.8 15 5 0.4 -35 50 0.01 10 700
UNITS V V A A V V mA mA mA % mA pF pF k ohm
Notes: 1. Parameter is guaranteed by design and characterization. Not subject to production testing.
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Integrated Circuit Systems, Inc.
9154A
Electrical Characteristics at 5.0 V
VDD = +5 10% V, TA = 0 - 70oC unless otherwise stated
AC Characteristics PARAMETER Input Clock Rise Time1 Input Clock Fall Time1 Output Rise time, 0.8 to 2.0V1 Rise time, 20% to 80% V 1 Output Fall time, 2.0 to 0.8V1 Fall time, 80% to 20% V1 Duty cycle at 1.4V1 Duty cycle, reference clocks1 Jitter, one sigma, 20 MHz- 80 MHz clocks1 Jitter, one sigma, clocks below 20 MHz1 Jitter, absolute, 20 MHz- 80 MHz clocks1 Jitter, absolute, clocks below 20 MHz1 Input Frequency Maximum Output Frequency1 Clock skew between CPU and 2XCPU outputs1 Power-up Time1 Frequency Transition Time1 SYMBOL tICr tICf tr tr tf tf dt dt tj1s tjls tjab tjab fin fout Tsk ttPO tft 9154A-42 to 80 MHz from 8 to 66.66 MHz 15pF load 15pF load 15pF load 15pF load 15pF load, VDD = 5V5% 15 pF load 10,000 cycles 10,000 cycles 10,000 cycles 10,000 cycles TEST CONDITIONS MIN 45/55 40/65 -250 2 140 TYP 1.5 2.0 0. 5 2.0 48/52 43/57 70 0.8 1.0 14.318 14 0 8 6.5 MAX 20 20 2 3 1.5 3.0 55/45 65/40 140 2.0 250 3.0 32 400 15 12 UNITS ns ns ns ns ns ns % % ps % ps % MHz MHz ps ms ms
Notes: 1. Parameter is guaranteed by design and characterization. Not subject to production testing.
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Integrated Circuit Systems, Inc.
9154A
0.031
0.390
0.063
0.238 0.015 0.154 0.008
0.024 0.016
0.050
0.0060.004 0.025
16-Pin SOIC Package
Ordering Information
9154A-04CS16 9154A-10CS16 9154A-27CS16 9154A-42CS16 9154A-43CS16
Example:
9154A - PPC S 16 LF
Lead Free, RoHS Compliant (Optional) Lead Count Package Type S = SOIC Pattern Number (2 digit number for parts with ROM-code patterns) Device Type
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Integrated Circuit Systems, Inc.
9154A
Revision History
Rev. C D E Issue Date 4/6/2006 1/24/2008 3/18/2008 Description Added LF Ordering Information Removed DIP Ordering Information. Removed reference to "AV". Page # 10 -
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